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34dc7c2f BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
faf0f58c | 23 | * Copyright (c) 2011, 2014 by Delphix. All rights reserved. |
632a242e | 24 | * Copyright 2011 Nexenta Systems, Inc. All rights reserved. |
37abac6d | 25 | * Copyright (c) 2012, Joyent, Inc. All rights reserved. |
6c59307a | 26 | * Copyright 2014 HybridCluster. All rights reserved. |
0c66c32d | 27 | * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. |
34dc7c2f BB |
28 | */ |
29 | ||
428870ff BB |
30 | /* Portions Copyright 2010 Robert Milkowski */ |
31 | ||
34dc7c2f BB |
32 | #ifndef _SYS_DMU_H |
33 | #define _SYS_DMU_H | |
34 | ||
34dc7c2f BB |
35 | /* |
36 | * This file describes the interface that the DMU provides for its | |
37 | * consumers. | |
38 | * | |
39 | * The DMU also interacts with the SPA. That interface is described in | |
40 | * dmu_spa.h. | |
41 | */ | |
42 | ||
0c66c32d | 43 | #include <sys/zfs_context.h> |
34dc7c2f | 44 | #include <sys/inttypes.h> |
34dc7c2f | 45 | #include <sys/cred.h> |
6f1ffb06 | 46 | #include <sys/fs/zfs.h> |
59e6e7ca | 47 | #include <sys/uio.h> |
34dc7c2f BB |
48 | |
49 | #ifdef __cplusplus | |
50 | extern "C" { | |
51 | #endif | |
52 | ||
34dc7c2f BB |
53 | struct page; |
54 | struct vnode; | |
55 | struct spa; | |
56 | struct zilog; | |
57 | struct zio; | |
58 | struct blkptr; | |
59 | struct zap_cursor; | |
60 | struct dsl_dataset; | |
61 | struct dsl_pool; | |
62 | struct dnode; | |
63 | struct drr_begin; | |
64 | struct drr_end; | |
5dbd68a3 | 65 | struct zbookmark_phys; |
34dc7c2f BB |
66 | struct spa; |
67 | struct nvlist; | |
9babb374 | 68 | struct arc_buf; |
428870ff BB |
69 | struct zio_prop; |
70 | struct sa_handle; | |
34dc7c2f BB |
71 | |
72 | typedef struct objset objset_t; | |
73 | typedef struct dmu_tx dmu_tx_t; | |
74 | typedef struct dsl_dir dsl_dir_t; | |
75 | ||
9ae529ec CS |
76 | typedef enum dmu_object_byteswap { |
77 | DMU_BSWAP_UINT8, | |
78 | DMU_BSWAP_UINT16, | |
79 | DMU_BSWAP_UINT32, | |
80 | DMU_BSWAP_UINT64, | |
81 | DMU_BSWAP_ZAP, | |
82 | DMU_BSWAP_DNODE, | |
83 | DMU_BSWAP_OBJSET, | |
84 | DMU_BSWAP_ZNODE, | |
85 | DMU_BSWAP_OLDACL, | |
86 | DMU_BSWAP_ACL, | |
87 | /* | |
88 | * Allocating a new byteswap type number makes the on-disk format | |
89 | * incompatible with any other format that uses the same number. | |
90 | * | |
91 | * Data can usually be structured to work with one of the | |
92 | * DMU_BSWAP_UINT* or DMU_BSWAP_ZAP types. | |
93 | */ | |
94 | DMU_BSWAP_NUMFUNCS | |
95 | } dmu_object_byteswap_t; | |
96 | ||
97 | #define DMU_OT_NEWTYPE 0x80 | |
98 | #define DMU_OT_METADATA 0x40 | |
99 | #define DMU_OT_BYTESWAP_MASK 0x3f | |
100 | ||
101 | /* | |
102 | * Defines a uint8_t object type. Object types specify if the data | |
103 | * in the object is metadata (boolean) and how to byteswap the data | |
104 | * (dmu_object_byteswap_t). | |
105 | */ | |
106 | #define DMU_OT(byteswap, metadata) \ | |
107 | (DMU_OT_NEWTYPE | \ | |
108 | ((metadata) ? DMU_OT_METADATA : 0) | \ | |
109 | ((byteswap) & DMU_OT_BYTESWAP_MASK)) | |
110 | ||
111 | #define DMU_OT_IS_VALID(ot) (((ot) & DMU_OT_NEWTYPE) ? \ | |
112 | ((ot) & DMU_OT_BYTESWAP_MASK) < DMU_BSWAP_NUMFUNCS : \ | |
113 | (ot) < DMU_OT_NUMTYPES) | |
114 | ||
115 | #define DMU_OT_IS_METADATA(ot) (((ot) & DMU_OT_NEWTYPE) ? \ | |
116 | ((ot) & DMU_OT_METADATA) : \ | |
117 | dmu_ot[(int)(ot)].ot_metadata) | |
118 | ||
9b67f605 MA |
119 | /* |
120 | * These object types use bp_fill != 1 for their L0 bp's. Therefore they can't | |
121 | * have their data embedded (i.e. use a BP_IS_EMBEDDED() bp), because bp_fill | |
122 | * is repurposed for embedded BPs. | |
123 | */ | |
124 | #define DMU_OT_HAS_FILL(ot) \ | |
125 | ((ot) == DMU_OT_DNODE || (ot) == DMU_OT_OBJSET) | |
126 | ||
9ae529ec CS |
127 | #define DMU_OT_BYTESWAP(ot) (((ot) & DMU_OT_NEWTYPE) ? \ |
128 | ((ot) & DMU_OT_BYTESWAP_MASK) : \ | |
129 | dmu_ot[(int)(ot)].ot_byteswap) | |
130 | ||
34dc7c2f BB |
131 | typedef enum dmu_object_type { |
132 | DMU_OT_NONE, | |
133 | /* general: */ | |
134 | DMU_OT_OBJECT_DIRECTORY, /* ZAP */ | |
135 | DMU_OT_OBJECT_ARRAY, /* UINT64 */ | |
136 | DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */ | |
137 | DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */ | |
428870ff BB |
138 | DMU_OT_BPOBJ, /* UINT64 */ |
139 | DMU_OT_BPOBJ_HDR, /* UINT64 */ | |
34dc7c2f BB |
140 | /* spa: */ |
141 | DMU_OT_SPACE_MAP_HEADER, /* UINT64 */ | |
142 | DMU_OT_SPACE_MAP, /* UINT64 */ | |
143 | /* zil: */ | |
144 | DMU_OT_INTENT_LOG, /* UINT64 */ | |
145 | /* dmu: */ | |
146 | DMU_OT_DNODE, /* DNODE */ | |
147 | DMU_OT_OBJSET, /* OBJSET */ | |
148 | /* dsl: */ | |
149 | DMU_OT_DSL_DIR, /* UINT64 */ | |
150 | DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */ | |
151 | DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */ | |
152 | DMU_OT_DSL_PROPS, /* ZAP */ | |
153 | DMU_OT_DSL_DATASET, /* UINT64 */ | |
154 | /* zpl: */ | |
155 | DMU_OT_ZNODE, /* ZNODE */ | |
156 | DMU_OT_OLDACL, /* Old ACL */ | |
157 | DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */ | |
158 | DMU_OT_DIRECTORY_CONTENTS, /* ZAP */ | |
159 | DMU_OT_MASTER_NODE, /* ZAP */ | |
160 | DMU_OT_UNLINKED_SET, /* ZAP */ | |
161 | /* zvol: */ | |
162 | DMU_OT_ZVOL, /* UINT8 */ | |
163 | DMU_OT_ZVOL_PROP, /* ZAP */ | |
164 | /* other; for testing only! */ | |
165 | DMU_OT_PLAIN_OTHER, /* UINT8 */ | |
166 | DMU_OT_UINT64_OTHER, /* UINT64 */ | |
167 | DMU_OT_ZAP_OTHER, /* ZAP */ | |
168 | /* new object types: */ | |
169 | DMU_OT_ERROR_LOG, /* ZAP */ | |
170 | DMU_OT_SPA_HISTORY, /* UINT8 */ | |
171 | DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */ | |
172 | DMU_OT_POOL_PROPS, /* ZAP */ | |
173 | DMU_OT_DSL_PERMS, /* ZAP */ | |
174 | DMU_OT_ACL, /* ACL */ | |
175 | DMU_OT_SYSACL, /* SYSACL */ | |
176 | DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */ | |
177 | DMU_OT_FUID_SIZE, /* FUID table size UINT64 */ | |
b128c09f | 178 | DMU_OT_NEXT_CLONES, /* ZAP */ |
428870ff | 179 | DMU_OT_SCAN_QUEUE, /* ZAP */ |
9babb374 BB |
180 | DMU_OT_USERGROUP_USED, /* ZAP */ |
181 | DMU_OT_USERGROUP_QUOTA, /* ZAP */ | |
45d1cae3 | 182 | DMU_OT_USERREFS, /* ZAP */ |
428870ff BB |
183 | DMU_OT_DDT_ZAP, /* ZAP */ |
184 | DMU_OT_DDT_STATS, /* ZAP */ | |
185 | DMU_OT_SA, /* System attr */ | |
186 | DMU_OT_SA_MASTER_NODE, /* ZAP */ | |
187 | DMU_OT_SA_ATTR_REGISTRATION, /* ZAP */ | |
188 | DMU_OT_SA_ATTR_LAYOUTS, /* ZAP */ | |
189 | DMU_OT_SCAN_XLATE, /* ZAP */ | |
190 | DMU_OT_DEDUP, /* fake dedup BP from ddt_bp_create() */ | |
191 | DMU_OT_DEADLIST, /* ZAP */ | |
192 | DMU_OT_DEADLIST_HDR, /* UINT64 */ | |
193 | DMU_OT_DSL_CLONES, /* ZAP */ | |
194 | DMU_OT_BPOBJ_SUBOBJ, /* UINT64 */ | |
9ae529ec CS |
195 | /* |
196 | * Do not allocate new object types here. Doing so makes the on-disk | |
197 | * format incompatible with any other format that uses the same object | |
198 | * type number. | |
199 | * | |
200 | * When creating an object which does not have one of the above types | |
201 | * use the DMU_OTN_* type with the correct byteswap and metadata | |
202 | * values. | |
203 | * | |
204 | * The DMU_OTN_* types do not have entries in the dmu_ot table, | |
205 | * use the DMU_OT_IS_METDATA() and DMU_OT_BYTESWAP() macros instead | |
206 | * of indexing into dmu_ot directly (this works for both DMU_OT_* types | |
207 | * and DMU_OTN_* types). | |
208 | */ | |
209 | DMU_OT_NUMTYPES, | |
210 | ||
211 | /* | |
212 | * Names for valid types declared with DMU_OT(). | |
213 | */ | |
214 | DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE), | |
215 | DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE), | |
216 | DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE), | |
217 | DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE), | |
218 | DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE), | |
219 | DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE), | |
220 | DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE), | |
221 | DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE), | |
222 | DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE), | |
223 | DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE), | |
34dc7c2f BB |
224 | } dmu_object_type_t; |
225 | ||
13fe0198 MA |
226 | typedef enum txg_how { |
227 | TXG_WAIT = 1, | |
228 | TXG_NOWAIT, | |
e8b96c60 | 229 | TXG_WAITED, |
13fe0198 MA |
230 | } txg_how_t; |
231 | ||
34dc7c2f BB |
232 | void byteswap_uint64_array(void *buf, size_t size); |
233 | void byteswap_uint32_array(void *buf, size_t size); | |
234 | void byteswap_uint16_array(void *buf, size_t size); | |
235 | void byteswap_uint8_array(void *buf, size_t size); | |
236 | void zap_byteswap(void *buf, size_t size); | |
237 | void zfs_oldacl_byteswap(void *buf, size_t size); | |
238 | void zfs_acl_byteswap(void *buf, size_t size); | |
239 | void zfs_znode_byteswap(void *buf, size_t size); | |
240 | ||
34dc7c2f BB |
241 | #define DS_FIND_SNAPSHOTS (1<<0) |
242 | #define DS_FIND_CHILDREN (1<<1) | |
243 | ||
244 | /* | |
245 | * The maximum number of bytes that can be accessed as part of one | |
246 | * operation, including metadata. | |
247 | */ | |
f1512ee6 | 248 | #define DMU_MAX_ACCESS (64 * 1024 * 1024) /* 64MB */ |
b128c09f | 249 | #define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */ |
34dc7c2f | 250 | |
9babb374 BB |
251 | #define DMU_USERUSED_OBJECT (-1ULL) |
252 | #define DMU_GROUPUSED_OBJECT (-2ULL) | |
253 | ||
428870ff BB |
254 | /* |
255 | * artificial blkids for bonus buffer and spill blocks | |
256 | */ | |
257 | #define DMU_BONUS_BLKID (-1ULL) | |
258 | #define DMU_SPILL_BLKID (-2ULL) | |
34dc7c2f BB |
259 | /* |
260 | * Public routines to create, destroy, open, and close objsets. | |
261 | */ | |
428870ff BB |
262 | int dmu_objset_hold(const char *name, void *tag, objset_t **osp); |
263 | int dmu_objset_own(const char *name, dmu_objset_type_t type, | |
264 | boolean_t readonly, void *tag, objset_t **osp); | |
265 | void dmu_objset_rele(objset_t *os, void *tag); | |
266 | void dmu_objset_disown(objset_t *os, void *tag); | |
267 | int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp); | |
268 | ||
13fe0198 | 269 | void dmu_objset_evict_dbufs(objset_t *os); |
428870ff | 270 | int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, |
34dc7c2f | 271 | void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg); |
13fe0198 MA |
272 | int dmu_objset_clone(const char *name, const char *origin); |
273 | int dsl_destroy_snapshots_nvl(struct nvlist *snaps, boolean_t defer, | |
6f1ffb06 | 274 | struct nvlist *errlist); |
6f1ffb06 MA |
275 | int dmu_objset_snapshot_one(const char *fsname, const char *snapname); |
276 | int dmu_objset_snapshot_tmp(const char *, const char *, int); | |
428870ff | 277 | int dmu_objset_find(char *name, int func(const char *, void *), void *arg, |
34dc7c2f BB |
278 | int flags); |
279 | void dmu_objset_byteswap(void *buf, size_t size); | |
13fe0198 MA |
280 | int dsl_dataset_rename_snapshot(const char *fsname, |
281 | const char *oldsnapname, const char *newsnapname, boolean_t recursive); | |
34dc7c2f BB |
282 | |
283 | typedef struct dmu_buf { | |
284 | uint64_t db_object; /* object that this buffer is part of */ | |
285 | uint64_t db_offset; /* byte offset in this object */ | |
286 | uint64_t db_size; /* size of buffer in bytes */ | |
287 | void *db_data; /* data in buffer */ | |
288 | } dmu_buf_t; | |
289 | ||
34dc7c2f BB |
290 | /* |
291 | * The names of zap entries in the DIRECTORY_OBJECT of the MOS. | |
292 | */ | |
293 | #define DMU_POOL_DIRECTORY_OBJECT 1 | |
294 | #define DMU_POOL_CONFIG "config" | |
9ae529ec CS |
295 | #define DMU_POOL_FEATURES_FOR_WRITE "features_for_write" |
296 | #define DMU_POOL_FEATURES_FOR_READ "features_for_read" | |
297 | #define DMU_POOL_FEATURE_DESCRIPTIONS "feature_descriptions" | |
b0bc7a84 | 298 | #define DMU_POOL_FEATURE_ENABLED_TXG "feature_enabled_txg" |
34dc7c2f | 299 | #define DMU_POOL_ROOT_DATASET "root_dataset" |
428870ff | 300 | #define DMU_POOL_SYNC_BPOBJ "sync_bplist" |
34dc7c2f BB |
301 | #define DMU_POOL_ERRLOG_SCRUB "errlog_scrub" |
302 | #define DMU_POOL_ERRLOG_LAST "errlog_last" | |
303 | #define DMU_POOL_SPARES "spares" | |
304 | #define DMU_POOL_DEFLATE "deflate" | |
305 | #define DMU_POOL_HISTORY "history" | |
306 | #define DMU_POOL_PROPS "pool_props" | |
307 | #define DMU_POOL_L2CACHE "l2cache" | |
428870ff BB |
308 | #define DMU_POOL_TMP_USERREFS "tmp_userrefs" |
309 | #define DMU_POOL_DDT "DDT-%s-%s-%s" | |
310 | #define DMU_POOL_DDT_STATS "DDT-statistics" | |
311 | #define DMU_POOL_CREATION_VERSION "creation_version" | |
312 | #define DMU_POOL_SCAN "scan" | |
313 | #define DMU_POOL_FREE_BPOBJ "free_bpobj" | |
9ae529ec | 314 | #define DMU_POOL_BPTREE_OBJ "bptree_obj" |
753c3839 | 315 | #define DMU_POOL_EMPTY_BPOBJ "empty_bpobj" |
b128c09f | 316 | |
34dc7c2f BB |
317 | /* |
318 | * Allocate an object from this objset. The range of object numbers | |
319 | * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode. | |
320 | * | |
321 | * The transaction must be assigned to a txg. The newly allocated | |
322 | * object will be "held" in the transaction (ie. you can modify the | |
323 | * newly allocated object in this transaction). | |
324 | * | |
325 | * dmu_object_alloc() chooses an object and returns it in *objectp. | |
326 | * | |
327 | * dmu_object_claim() allocates a specific object number. If that | |
328 | * number is already allocated, it fails and returns EEXIST. | |
329 | * | |
330 | * Return 0 on success, or ENOSPC or EEXIST as specified above. | |
331 | */ | |
332 | uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot, | |
333 | int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); | |
334 | int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot, | |
335 | int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx); | |
336 | int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot, | |
6c59307a | 337 | int blocksize, dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *txp); |
34dc7c2f BB |
338 | |
339 | /* | |
340 | * Free an object from this objset. | |
341 | * | |
342 | * The object's data will be freed as well (ie. you don't need to call | |
343 | * dmu_free(object, 0, -1, tx)). | |
344 | * | |
345 | * The object need not be held in the transaction. | |
346 | * | |
347 | * If there are any holds on this object's buffers (via dmu_buf_hold()), | |
348 | * or tx holds on the object (via dmu_tx_hold_object()), you can not | |
349 | * free it; it fails and returns EBUSY. | |
350 | * | |
351 | * If the object is not allocated, it fails and returns ENOENT. | |
352 | * | |
353 | * Return 0 on success, or EBUSY or ENOENT as specified above. | |
354 | */ | |
355 | int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx); | |
356 | ||
357 | /* | |
358 | * Find the next allocated or free object. | |
359 | * | |
360 | * The objectp parameter is in-out. It will be updated to be the next | |
361 | * object which is allocated. Ignore objects which have not been | |
362 | * modified since txg. | |
363 | * | |
364 | * XXX Can only be called on a objset with no dirty data. | |
365 | * | |
366 | * Returns 0 on success, or ENOENT if there are no more objects. | |
367 | */ | |
368 | int dmu_object_next(objset_t *os, uint64_t *objectp, | |
369 | boolean_t hole, uint64_t txg); | |
370 | ||
371 | /* | |
372 | * Set the data blocksize for an object. | |
373 | * | |
374 | * The object cannot have any blocks allcated beyond the first. If | |
375 | * the first block is allocated already, the new size must be greater | |
376 | * than the current block size. If these conditions are not met, | |
377 | * ENOTSUP will be returned. | |
378 | * | |
379 | * Returns 0 on success, or EBUSY if there are any holds on the object | |
380 | * contents, or ENOTSUP as described above. | |
381 | */ | |
382 | int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size, | |
383 | int ibs, dmu_tx_t *tx); | |
384 | ||
385 | /* | |
386 | * Set the checksum property on a dnode. The new checksum algorithm will | |
387 | * apply to all newly written blocks; existing blocks will not be affected. | |
388 | */ | |
389 | void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum, | |
390 | dmu_tx_t *tx); | |
391 | ||
392 | /* | |
393 | * Set the compress property on a dnode. The new compression algorithm will | |
394 | * apply to all newly written blocks; existing blocks will not be affected. | |
395 | */ | |
396 | void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress, | |
397 | dmu_tx_t *tx); | |
398 | ||
9b67f605 MA |
399 | void |
400 | dmu_write_embedded(objset_t *os, uint64_t object, uint64_t offset, | |
401 | void *data, uint8_t etype, uint8_t comp, int uncompressed_size, | |
402 | int compressed_size, int byteorder, dmu_tx_t *tx); | |
403 | ||
34dc7c2f | 404 | /* |
428870ff | 405 | * Decide how to write a block: checksum, compression, number of copies, etc. |
34dc7c2f | 406 | */ |
428870ff BB |
407 | #define WP_NOFILL 0x1 |
408 | #define WP_DMU_SYNC 0x2 | |
409 | #define WP_SPILL 0x4 | |
410 | ||
411 | void dmu_write_policy(objset_t *os, struct dnode *dn, int level, int wp, | |
412 | struct zio_prop *zp); | |
34dc7c2f BB |
413 | /* |
414 | * The bonus data is accessed more or less like a regular buffer. | |
415 | * You must dmu_bonus_hold() to get the buffer, which will give you a | |
416 | * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus | |
417 | * data. As with any normal buffer, you must call dmu_buf_read() to | |
418 | * read db_data, dmu_buf_will_dirty() before modifying it, and the | |
419 | * object must be held in an assigned transaction before calling | |
420 | * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus | |
4e95cc99 | 421 | * buffer as well. You must release what you hold with dmu_buf_rele(). |
e49f1e20 WA |
422 | * |
423 | * Returns ENOENT, EIO, or 0. | |
34dc7c2f BB |
424 | */ |
425 | int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **); | |
426 | int dmu_bonus_max(void); | |
427 | int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *); | |
428870ff | 428 | int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *); |
572e2857 | 429 | dmu_object_type_t dmu_get_bonustype(dmu_buf_t *); |
428870ff BB |
430 | int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *); |
431 | ||
432 | /* | |
433 | * Special spill buffer support used by "SA" framework | |
434 | */ | |
435 | ||
436 | int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp); | |
437 | int dmu_spill_hold_by_dnode(struct dnode *dn, uint32_t flags, | |
438 | void *tag, dmu_buf_t **dbp); | |
439 | int dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp); | |
34dc7c2f BB |
440 | |
441 | /* | |
442 | * Obtain the DMU buffer from the specified object which contains the | |
443 | * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so | |
444 | * that it will remain in memory. You must release the hold with | |
4e95cc99 JE |
445 | * dmu_buf_rele(). You must not access the dmu_buf_t after releasing |
446 | * what you hold. You must have a hold on any dmu_buf_t* you pass to the DMU. | |
34dc7c2f BB |
447 | * |
448 | * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill | |
449 | * on the returned buffer before reading or writing the buffer's | |
450 | * db_data. The comments for those routines describe what particular | |
451 | * operations are valid after calling them. | |
452 | * | |
453 | * The object number must be a valid, allocated object number. | |
454 | */ | |
455 | int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset, | |
428870ff | 456 | void *tag, dmu_buf_t **, int flags); |
6ebebace JG |
457 | |
458 | /* | |
459 | * Add a reference to a dmu buffer that has already been held via | |
460 | * dmu_buf_hold() in the current context. | |
461 | */ | |
34dc7c2f | 462 | void dmu_buf_add_ref(dmu_buf_t *db, void* tag); |
6ebebace JG |
463 | |
464 | /* | |
465 | * Attempt to add a reference to a dmu buffer that is in an unknown state, | |
466 | * using a pointer that may have been invalidated by eviction processing. | |
467 | * The request will succeed if the passed in dbuf still represents the | |
468 | * same os/object/blkid, is ineligible for eviction, and has at least | |
469 | * one hold by a user other than the syncer. | |
470 | */ | |
471 | boolean_t dmu_buf_try_add_ref(dmu_buf_t *, objset_t *os, uint64_t object, | |
472 | uint64_t blkid, void *tag); | |
473 | ||
34dc7c2f BB |
474 | void dmu_buf_rele(dmu_buf_t *db, void *tag); |
475 | uint64_t dmu_buf_refcount(dmu_buf_t *db); | |
476 | ||
477 | /* | |
478 | * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a | |
479 | * range of an object. A pointer to an array of dmu_buf_t*'s is | |
480 | * returned (in *dbpp). | |
481 | * | |
482 | * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and | |
483 | * frees the array. The hold on the array of buffers MUST be released | |
484 | * with dmu_buf_rele_array. You can NOT release the hold on each buffer | |
485 | * individually with dmu_buf_rele. | |
486 | */ | |
487 | int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset, | |
488 | uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp); | |
489 | void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag); | |
490 | ||
0c66c32d JG |
491 | typedef void dmu_buf_evict_func_t(void *user_ptr); |
492 | ||
34dc7c2f | 493 | /* |
0c66c32d JG |
494 | * A DMU buffer user object may be associated with a dbuf for the |
495 | * duration of its lifetime. This allows the user of a dbuf (client) | |
496 | * to attach private data to a dbuf (e.g. in-core only data such as a | |
497 | * dnode_children_t, zap_t, or zap_leaf_t) and be optionally notified | |
498 | * when that dbuf has been evicted. Clients typically respond to the | |
499 | * eviction notification by freeing their private data, thus ensuring | |
500 | * the same lifetime for both dbuf and private data. | |
34dc7c2f | 501 | * |
0c66c32d JG |
502 | * The mapping from a dmu_buf_user_t to any client private data is the |
503 | * client's responsibility. All current consumers of the API with private | |
504 | * data embed a dmu_buf_user_t as the first member of the structure for | |
505 | * their private data. This allows conversions between the two types | |
506 | * with a simple cast. Since the DMU buf user API never needs access | |
507 | * to the private data, other strategies can be employed if necessary | |
508 | * or convenient for the client (e.g. using container_of() to do the | |
509 | * conversion for private data that cannot have the dmu_buf_user_t as | |
510 | * its first member). | |
34dc7c2f | 511 | * |
0c66c32d JG |
512 | * Eviction callbacks are executed without the dbuf mutex held or any |
513 | * other type of mechanism to guarantee that the dbuf is still available. | |
514 | * For this reason, users must assume the dbuf has already been freed | |
515 | * and not reference the dbuf from the callback context. | |
34dc7c2f | 516 | * |
0c66c32d JG |
517 | * Users requesting "immediate eviction" are notified as soon as the dbuf |
518 | * is only referenced by dirty records (dirties == holds). Otherwise the | |
519 | * notification occurs after eviction processing for the dbuf begins. | |
34dc7c2f | 520 | */ |
0c66c32d JG |
521 | typedef struct dmu_buf_user { |
522 | /* | |
523 | * Asynchronous user eviction callback state. | |
524 | */ | |
525 | taskq_ent_t dbu_tqent; | |
526 | ||
527 | /* This instance's eviction function pointer. */ | |
528 | dmu_buf_evict_func_t *dbu_evict_func; | |
529 | #ifdef ZFS_DEBUG | |
530 | /* | |
531 | * Pointer to user's dbuf pointer. NULL for clients that do | |
532 | * not associate a dbuf with their user data. | |
533 | * | |
534 | * The dbuf pointer is cleared upon eviction so as to catch | |
535 | * use-after-evict bugs in clients. | |
536 | */ | |
537 | dmu_buf_t **dbu_clear_on_evict_dbufp; | |
538 | #endif | |
539 | } dmu_buf_user_t; | |
540 | ||
34dc7c2f | 541 | /* |
0c66c32d JG |
542 | * Initialize the given dmu_buf_user_t instance with the eviction function |
543 | * evict_func, to be called when the user is evicted. | |
544 | * | |
545 | * NOTE: This function should only be called once on a given dmu_buf_user_t. | |
546 | * To allow enforcement of this, dbu must already be zeroed on entry. | |
34dc7c2f | 547 | */ |
0c66c32d JG |
548 | #ifdef __lint |
549 | /* Very ugly, but it beats issuing suppression directives in many Makefiles. */ | |
550 | extern void | |
551 | dmu_buf_init_user(dmu_buf_user_t *dbu, dmu_buf_evict_func_t *evict_func, | |
552 | dmu_buf_t **clear_on_evict_dbufp); | |
553 | #else /* __lint */ | |
554 | static inline void | |
555 | dmu_buf_init_user(dmu_buf_user_t *dbu, dmu_buf_evict_func_t *evict_func, | |
556 | dmu_buf_t **clear_on_evict_dbufp) | |
557 | { | |
558 | ASSERT(dbu->dbu_evict_func == NULL); | |
559 | ASSERT(evict_func != NULL); | |
560 | dbu->dbu_evict_func = evict_func; | |
561 | #ifdef ZFS_DEBUG | |
562 | dbu->dbu_clear_on_evict_dbufp = clear_on_evict_dbufp; | |
563 | #endif | |
564 | } | |
565 | #endif /* __lint */ | |
34dc7c2f BB |
566 | |
567 | /* | |
0c66c32d JG |
568 | * Attach user data to a dbuf and mark it for normal (when the dbuf's |
569 | * data is cleared or its reference count goes to zero) eviction processing. | |
570 | * | |
571 | * Returns NULL on success, or the existing user if another user currently | |
572 | * owns the buffer. | |
573 | */ | |
574 | void *dmu_buf_set_user(dmu_buf_t *db, dmu_buf_user_t *user); | |
575 | ||
576 | /* | |
577 | * Attach user data to a dbuf and mark it for immediate (its dirty and | |
578 | * reference counts are equal) eviction processing. | |
579 | * | |
580 | * Returns NULL on success, or the existing user if another user currently | |
581 | * owns the buffer. | |
582 | */ | |
583 | void *dmu_buf_set_user_ie(dmu_buf_t *db, dmu_buf_user_t *user); | |
584 | ||
585 | /* | |
586 | * Replace the current user of a dbuf. | |
587 | * | |
588 | * If given the current user of a dbuf, replaces the dbuf's user with | |
589 | * "new_user" and returns the user data pointer that was replaced. | |
590 | * Otherwise returns the current, and unmodified, dbuf user pointer. | |
591 | */ | |
592 | void *dmu_buf_replace_user(dmu_buf_t *db, | |
593 | dmu_buf_user_t *old_user, dmu_buf_user_t *new_user); | |
594 | ||
595 | /* | |
596 | * Remove the specified user data for a DMU buffer. | |
597 | * | |
598 | * Returns the user that was removed on success, or the current user if | |
599 | * another user currently owns the buffer. | |
600 | */ | |
601 | void *dmu_buf_remove_user(dmu_buf_t *db, dmu_buf_user_t *user); | |
602 | ||
603 | /* | |
604 | * Returns the user data (dmu_buf_user_t *) associated with this dbuf. | |
34dc7c2f BB |
605 | */ |
606 | void *dmu_buf_get_user(dmu_buf_t *db); | |
607 | ||
0c66c32d JG |
608 | /* Block until any in-progress dmu buf user evictions complete. */ |
609 | void dmu_buf_user_evict_wait(void); | |
610 | ||
03c6040b GW |
611 | /* |
612 | * Returns the blkptr associated with this dbuf, or NULL if not set. | |
613 | */ | |
614 | struct blkptr *dmu_buf_get_blkptr(dmu_buf_t *db); | |
615 | ||
34dc7c2f BB |
616 | /* |
617 | * Indicate that you are going to modify the buffer's data (db_data). | |
618 | * | |
619 | * The transaction (tx) must be assigned to a txg (ie. you've called | |
620 | * dmu_tx_assign()). The buffer's object must be held in the tx | |
621 | * (ie. you've called dmu_tx_hold_object(tx, db->db_object)). | |
622 | */ | |
623 | void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx); | |
624 | ||
9babb374 BB |
625 | /* |
626 | * Tells if the given dbuf is freeable. | |
627 | */ | |
628 | boolean_t dmu_buf_freeable(dmu_buf_t *); | |
629 | ||
34dc7c2f BB |
630 | /* |
631 | * You must create a transaction, then hold the objects which you will | |
632 | * (or might) modify as part of this transaction. Then you must assign | |
633 | * the transaction to a transaction group. Once the transaction has | |
634 | * been assigned, you can modify buffers which belong to held objects as | |
635 | * part of this transaction. You can't modify buffers before the | |
636 | * transaction has been assigned; you can't modify buffers which don't | |
637 | * belong to objects which this transaction holds; you can't hold | |
638 | * objects once the transaction has been assigned. You may hold an | |
639 | * object which you are going to free (with dmu_object_free()), but you | |
640 | * don't have to. | |
641 | * | |
642 | * You can abort the transaction before it has been assigned. | |
643 | * | |
644 | * Note that you may hold buffers (with dmu_buf_hold) at any time, | |
645 | * regardless of transaction state. | |
646 | */ | |
647 | ||
648 | #define DMU_NEW_OBJECT (-1ULL) | |
649 | #define DMU_OBJECT_END (-1ULL) | |
650 | ||
651 | dmu_tx_t *dmu_tx_create(objset_t *os); | |
652 | void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len); | |
653 | void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off, | |
654 | uint64_t len); | |
9babb374 | 655 | void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name); |
34dc7c2f | 656 | void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object); |
428870ff BB |
657 | void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object); |
658 | void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow); | |
659 | void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size); | |
34dc7c2f | 660 | void dmu_tx_abort(dmu_tx_t *tx); |
13fe0198 | 661 | int dmu_tx_assign(dmu_tx_t *tx, enum txg_how txg_how); |
34dc7c2f BB |
662 | void dmu_tx_wait(dmu_tx_t *tx); |
663 | void dmu_tx_commit(dmu_tx_t *tx); | |
664 | ||
428870ff BB |
665 | /* |
666 | * To register a commit callback, dmu_tx_callback_register() must be called. | |
667 | * | |
668 | * dcb_data is a pointer to caller private data that is passed on as a | |
669 | * callback parameter. The caller is responsible for properly allocating and | |
670 | * freeing it. | |
671 | * | |
672 | * When registering a callback, the transaction must be already created, but | |
673 | * it cannot be committed or aborted. It can be assigned to a txg or not. | |
674 | * | |
675 | * The callback will be called after the transaction has been safely written | |
676 | * to stable storage and will also be called if the dmu_tx is aborted. | |
677 | * If there is any error which prevents the transaction from being committed to | |
678 | * disk, the callback will be called with a value of error != 0. | |
679 | */ | |
680 | typedef void dmu_tx_callback_func_t(void *dcb_data, int error); | |
681 | ||
682 | void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func, | |
683 | void *dcb_data); | |
684 | ||
34dc7c2f BB |
685 | /* |
686 | * Free up the data blocks for a defined range of a file. If size is | |
9ae529ec | 687 | * -1, the range from offset to end-of-file is freed. |
34dc7c2f BB |
688 | */ |
689 | int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset, | |
690 | uint64_t size, dmu_tx_t *tx); | |
b128c09f BB |
691 | int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset, |
692 | uint64_t size); | |
b663a23d | 693 | int dmu_free_long_object(objset_t *os, uint64_t object); |
34dc7c2f BB |
694 | |
695 | /* | |
696 | * Convenience functions. | |
697 | * | |
698 | * Canfail routines will return 0 on success, or an errno if there is a | |
699 | * nonrecoverable I/O error. | |
700 | */ | |
9babb374 BB |
701 | #define DMU_READ_PREFETCH 0 /* prefetch */ |
702 | #define DMU_READ_NO_PREFETCH 1 /* don't prefetch */ | |
34dc7c2f | 703 | int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, |
9babb374 | 704 | void *buf, uint32_t flags); |
34dc7c2f BB |
705 | void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, |
706 | const void *buf, dmu_tx_t *tx); | |
b128c09f BB |
707 | void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size, |
708 | dmu_tx_t *tx); | |
60101509 | 709 | #ifdef _KERNEL |
61e90960 | 710 | #include <linux/blkdev_compat.h> |
60101509 | 711 | int dmu_read_req(objset_t *os, uint64_t object, struct request *req); |
872e8d26 BB |
712 | int dmu_write_req(objset_t *os, uint64_t object, struct request *req, |
713 | dmu_tx_t *tx); | |
714 | int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size); | |
715 | int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size, | |
716 | dmu_tx_t *tx); | |
717 | int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size, | |
718 | dmu_tx_t *tx); | |
872e8d26 | 719 | #endif |
9babb374 BB |
720 | struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size); |
721 | void dmu_return_arcbuf(struct arc_buf *buf); | |
722 | void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf, | |
723 | dmu_tx_t *tx); | |
428870ff BB |
724 | int dmu_xuio_init(struct xuio *uio, int niov); |
725 | void dmu_xuio_fini(struct xuio *uio); | |
726 | int dmu_xuio_add(struct xuio *uio, struct arc_buf *abuf, offset_t off, | |
727 | size_t n); | |
728 | int dmu_xuio_cnt(struct xuio *uio); | |
729 | struct arc_buf *dmu_xuio_arcbuf(struct xuio *uio, int i); | |
730 | void dmu_xuio_clear(struct xuio *uio, int i); | |
0bc8fd78 BB |
731 | void xuio_stat_wbuf_copied(void); |
732 | void xuio_stat_wbuf_nocopy(void); | |
34dc7c2f BB |
733 | |
734 | extern int zfs_prefetch_disable; | |
f1512ee6 | 735 | extern int zfs_max_recordsize; |
34dc7c2f BB |
736 | |
737 | /* | |
738 | * Asynchronously try to read in the data. | |
739 | */ | |
740 | void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, | |
741 | uint64_t len); | |
742 | ||
743 | typedef struct dmu_object_info { | |
428870ff | 744 | /* All sizes are in bytes unless otherwise indicated. */ |
34dc7c2f BB |
745 | uint32_t doi_data_block_size; |
746 | uint32_t doi_metadata_block_size; | |
34dc7c2f BB |
747 | dmu_object_type_t doi_type; |
748 | dmu_object_type_t doi_bonus_type; | |
428870ff | 749 | uint64_t doi_bonus_size; |
34dc7c2f BB |
750 | uint8_t doi_indirection; /* 2 = dnode->indirect->data */ |
751 | uint8_t doi_checksum; | |
752 | uint8_t doi_compress; | |
6c59307a MA |
753 | uint8_t doi_nblkptr; |
754 | uint8_t doi_pad[4]; | |
428870ff BB |
755 | uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */ |
756 | uint64_t doi_max_offset; | |
757 | uint64_t doi_fill_count; /* number of non-empty blocks */ | |
34dc7c2f BB |
758 | } dmu_object_info_t; |
759 | ||
b01615d5 | 760 | typedef void (*const arc_byteswap_func_t)(void *buf, size_t size); |
34dc7c2f BB |
761 | |
762 | typedef struct dmu_object_type_info { | |
9ae529ec | 763 | dmu_object_byteswap_t ot_byteswap; |
34dc7c2f BB |
764 | boolean_t ot_metadata; |
765 | char *ot_name; | |
766 | } dmu_object_type_info_t; | |
767 | ||
b01615d5 RY |
768 | typedef const struct dmu_object_byteswap_info { |
769 | arc_byteswap_func_t ob_func; | |
9ae529ec CS |
770 | char *ob_name; |
771 | } dmu_object_byteswap_info_t; | |
772 | ||
34dc7c2f | 773 | extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES]; |
9ae529ec | 774 | extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS]; |
34dc7c2f BB |
775 | |
776 | /* | |
777 | * Get information on a DMU object. | |
778 | * | |
779 | * Return 0 on success or ENOENT if object is not allocated. | |
780 | * | |
781 | * If doi is NULL, just indicates whether the object exists. | |
782 | */ | |
783 | int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi); | |
e0b0ca98 | 784 | void __dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); |
e49f1e20 | 785 | /* Like dmu_object_info, but faster if you have a held dnode in hand. */ |
34dc7c2f | 786 | void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi); |
e49f1e20 | 787 | /* Like dmu_object_info, but faster if you have a held dbuf in hand. */ |
34dc7c2f | 788 | void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi); |
e49f1e20 WA |
789 | /* |
790 | * Like dmu_object_info_from_db, but faster still when you only care about | |
791 | * the size. This is specifically optimized for zfs_getattr(). | |
792 | */ | |
34dc7c2f BB |
793 | void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize, |
794 | u_longlong_t *nblk512); | |
795 | ||
796 | typedef struct dmu_objset_stats { | |
797 | uint64_t dds_num_clones; /* number of clones of this */ | |
798 | uint64_t dds_creation_txg; | |
799 | uint64_t dds_guid; | |
800 | dmu_objset_type_t dds_type; | |
801 | uint8_t dds_is_snapshot; | |
802 | uint8_t dds_inconsistent; | |
803 | char dds_origin[MAXNAMELEN]; | |
804 | } dmu_objset_stats_t; | |
805 | ||
806 | /* | |
807 | * Get stats on a dataset. | |
808 | */ | |
809 | void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat); | |
810 | ||
811 | /* | |
812 | * Add entries to the nvlist for all the objset's properties. See | |
813 | * zfs_prop_table[] and zfs(1m) for details on the properties. | |
814 | */ | |
815 | void dmu_objset_stats(objset_t *os, struct nvlist *nv); | |
816 | ||
817 | /* | |
818 | * Get the space usage statistics for statvfs(). | |
819 | * | |
820 | * refdbytes is the amount of space "referenced" by this objset. | |
821 | * availbytes is the amount of space available to this objset, taking | |
822 | * into account quotas & reservations, assuming that no other objsets | |
823 | * use the space first. These values correspond to the 'referenced' and | |
824 | * 'available' properties, described in the zfs(1m) manpage. | |
825 | * | |
826 | * usedobjs and availobjs are the number of objects currently allocated, | |
827 | * and available. | |
828 | */ | |
829 | void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, | |
830 | uint64_t *usedobjsp, uint64_t *availobjsp); | |
831 | ||
832 | /* | |
833 | * The fsid_guid is a 56-bit ID that can change to avoid collisions. | |
834 | * (Contrast with the ds_guid which is a 64-bit ID that will never | |
835 | * change, so there is a small probability that it will collide.) | |
836 | */ | |
837 | uint64_t dmu_objset_fsid_guid(objset_t *os); | |
838 | ||
428870ff BB |
839 | /* |
840 | * Get the [cm]time for an objset's snapshot dir | |
841 | */ | |
842 | timestruc_t dmu_objset_snap_cmtime(objset_t *os); | |
843 | ||
34dc7c2f BB |
844 | int dmu_objset_is_snapshot(objset_t *os); |
845 | ||
846 | extern struct spa *dmu_objset_spa(objset_t *os); | |
847 | extern struct zilog *dmu_objset_zil(objset_t *os); | |
848 | extern struct dsl_pool *dmu_objset_pool(objset_t *os); | |
849 | extern struct dsl_dataset *dmu_objset_ds(objset_t *os); | |
850 | extern void dmu_objset_name(objset_t *os, char *buf); | |
851 | extern dmu_objset_type_t dmu_objset_type(objset_t *os); | |
852 | extern uint64_t dmu_objset_id(objset_t *os); | |
faf0f58c MA |
853 | extern zfs_sync_type_t dmu_objset_syncprop(objset_t *os); |
854 | extern zfs_logbias_op_t dmu_objset_logbias(objset_t *os); | |
34dc7c2f BB |
855 | extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name, |
856 | uint64_t *id, uint64_t *offp, boolean_t *case_conflict); | |
6772fb67 | 857 | extern int dmu_snapshot_lookup(objset_t *os, const char *name, uint64_t *val); |
34dc7c2f BB |
858 | extern int dmu_snapshot_realname(objset_t *os, char *name, char *real, |
859 | int maxlen, boolean_t *conflict); | |
860 | extern int dmu_dir_list_next(objset_t *os, int namelen, char *name, | |
861 | uint64_t *idp, uint64_t *offp); | |
9babb374 | 862 | |
428870ff BB |
863 | typedef int objset_used_cb_t(dmu_object_type_t bonustype, |
864 | void *bonus, uint64_t *userp, uint64_t *groupp); | |
9babb374 BB |
865 | extern void dmu_objset_register_type(dmu_objset_type_t ost, |
866 | objset_used_cb_t *cb); | |
34dc7c2f BB |
867 | extern void dmu_objset_set_user(objset_t *os, void *user_ptr); |
868 | extern void *dmu_objset_get_user(objset_t *os); | |
869 | ||
870 | /* | |
871 | * Return the txg number for the given assigned transaction. | |
872 | */ | |
873 | uint64_t dmu_tx_get_txg(dmu_tx_t *tx); | |
874 | ||
875 | /* | |
876 | * Synchronous write. | |
877 | * If a parent zio is provided this function initiates a write on the | |
878 | * provided buffer as a child of the parent zio. | |
879 | * In the absence of a parent zio, the write is completed synchronously. | |
880 | * At write completion, blk is filled with the bp of the written block. | |
881 | * Note that while the data covered by this function will be on stable | |
882 | * storage when the write completes this new data does not become a | |
883 | * permanent part of the file until the associated transaction commits. | |
884 | */ | |
428870ff BB |
885 | |
886 | /* | |
887 | * {zfs,zvol,ztest}_get_done() args | |
888 | */ | |
889 | typedef struct zgd { | |
890 | struct zilog *zgd_zilog; | |
891 | struct blkptr *zgd_bp; | |
892 | dmu_buf_t *zgd_db; | |
893 | struct rl *zgd_rl; | |
894 | void *zgd_private; | |
895 | } zgd_t; | |
896 | ||
897 | typedef void dmu_sync_cb_t(zgd_t *arg, int error); | |
898 | int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd); | |
34dc7c2f BB |
899 | |
900 | /* | |
901 | * Find the next hole or data block in file starting at *off | |
902 | * Return found offset in *off. Return ESRCH for end of file. | |
903 | */ | |
904 | int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, | |
905 | uint64_t *off); | |
906 | ||
907 | /* | |
908 | * Initial setup and final teardown. | |
909 | */ | |
910 | extern void dmu_init(void); | |
911 | extern void dmu_fini(void); | |
912 | ||
913 | typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp, | |
914 | uint64_t object, uint64_t offset, int len); | |
915 | void dmu_traverse_objset(objset_t *os, uint64_t txg_start, | |
916 | dmu_traverse_cb_t cb, void *arg); | |
917 | ||
13fe0198 MA |
918 | int dmu_diff(const char *tosnap_name, const char *fromsnap_name, |
919 | struct vnode *vp, offset_t *offp); | |
572e2857 | 920 | |
34dc7c2f BB |
921 | /* CRC64 table */ |
922 | #define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */ | |
923 | extern uint64_t zfs_crc64_table[256]; | |
924 | ||
4e59f475 SK |
925 | extern int zfs_mdcomp_disable; |
926 | ||
34dc7c2f BB |
927 | #ifdef __cplusplus |
928 | } | |
929 | #endif | |
930 | ||
931 | #endif /* _SYS_DMU_H */ |